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With cause of Potomac sheen still unclear, group offers $1,000 reward

Oily substance on Potomac River can’t be recovered; no threat to drinking water

Sheen on Potomac River likely to reach area Wednesday

DC retesting all schools for lead after problems found in water sources

Local water tests turn up elevated levels of lead

What home sellers don’t tell you about lead

More drinking water

After D.C.’s crisis: How to make sure your drinking water is safe

Lead-contaminated water is putting kids at risk

Before Flint: D.C.鈥檚 drinking water crisis was even worse

Bi-county tunnel takes shape deep below Beltway